Well, Hasbro (or rather, Megan's team working on G5) don't know what the concept artists work on until they show them, + they give them free artistic will to come up with new interesting ideas (for example, Twilight with the star on her forehead) - or at least that's what I believe they do, it usually works like this with different concept artists working on one show, so that's why the Mane 6 has more horsey designs (r.i.p. applejack) And toys? Well... I don't want to be very pesimistic, but I believe they won't be as good as - for example - G1 ponies. This ComicCon Twilight is quite 'special', but she still looks (material-wise) much much worse than G3 ponies. And the retro Mane 6? I have some McDonald vibes from them.
Sorry if this all sounds very un-possitive and like some crazy rambling, but I don't have much hope left in Hasbro nowadays. They can sell low-quality toys and people will buy them... but I'l try to say something possitive, and that's the fact we will get ponies with different builds, sizes, more variants, etc. which might be truly great ^^